Insertion of Stylets of Aphids and Plant Tissues

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  • SORIN Masato
    Junior College of Agriculture, University of Osaka Prefecture

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  • アブラムシの口針そう入と植物組織
  • アブラムシ ノ クチシン ソウニュウ ト ショクブツ ソシキ

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Abstract

The insertion of stylets into host plants has been studied in 34 species of aphids belonging 25 genera. Aphids feeding on host plants were quickly paralyzed with ethyl ether, and plant portions with aphids were fixed by formalin (10%) for 24-48 hours. Paraffin sections, 15μ thick, were stained with DELAFIELD'S hematoxyline, safranine T and acid fuchsin. The main results are summarized as follows:<br>1. In most species the stylets are inserted into epidermis intercellularly, intracellularly or sometimes through stomata, but Ceratovacuna lanigera ZEHNTNER on Miscanthus and Schizolachnus orientalis TAKAHASHI on pine leaves insert the stylets into the plants always only through the stomata of the leaves.<br>2. In many species the stylets inserted in plant tissues pass usually intercellularly, and also frequently intracellularly through even cells containing crystals, but insert intercellularly in sclerenchyma or parenchyma. Schizolachnus orientalis TAKAHASHI inserts the stylets always intracellularly through the insert parenchyma and endodermis of the leaves of Pinus densiflora.<br>3. The stylet sheaths or salivary sheaths are usually more developed within cells than between them and are formed even in air between the tip of rostrum and the surface of plant epidermis, or between the leaf sheath and the stem, when aphids feed on the stem through the sheath.<br>4. The stylets usually reach phloem, especially sieve tubes, but were observed reaching xylem or bundle sheaths in a few cases. They do not necessarily extend to the nearest phloem, and sometimes pass round about through cortex, pith ray or pith, and in some cases are extending in phloem or xylem.

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